OK that's when he was arrested, but why?
http://www.ctnow.com/news/wxin-man-punches-tsa-screener-at-in-111810,0,1368312.story
“But Christina says that the punch was intended to be a joke, not a challenge to the agent’s authority or the agency’s security procedures.
Christina stated he has had several medical issues and asked the TSA screener a question about the screening process.
When the TSA screener said he did not know, Christina “jokingly lightly punched him in the chest” and told him you should know.”